The animation was fine, and the voices sounded okay. But this is a bad prologue, it seems to tell whatever it needed to say about the characters and what they were doing there, but there is nothing to look forward to. this video seems like an ending more than a prologue. The characters are NOT characters, because they have no personality, the only hint was i guess the writing at the end and that's too little.
the animation was cool though, it's just not enough to make it a good piece of entertainment. IMO